Summary
The distribution patterns of serotonin-immunoreactive somata in the cerebral and subpharyngeal ganglion, and in the head and tail ganglia of the nerve cord of Lumbricus terrestris are described from whole-mount preparations. A small number of serotonin-immunoreactive neurons occurs in the cerebral ganglion, in contrast to the large population of serotonin-immunoreactive neurons that exists in all parts of the ventral nerve cord. From the arrangement of serotonin-immunoreactive somata in the subpharyngeal ganglion, we suggest that this ganglion arises from the fusion of two primordial ganglia. In head and tail ganglia, the distribution of serotonin-immunoreactive somata resembles that in midbody segments. Segmental variations in the pattern and number of serotonin-immunoreactive somata in the different body regions are discussed on the background of known developmental mechanisms that result in metameric neuronal populations in annelids and arthropods.
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Abbreviations
- CG1, CG2 :
-
cerebral soma group 1, 2
- CNS :
-
central nervous system
- GINs :
-
giant interneurons
- 5-HT :
-
5-hydroxytryptamine, serotonin
- 5-HTi :
-
5-HT-immunoreactive
- N :
-
side nerve
- SG19 :
-
subpharyngeal soma group 1–9
- SN :
-
segmental nerve
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Spörhase-Eichmann, U., Gras, H. & Schürmann, FW. Patterns of serotonin-immunoreactive neurons in the central nervous system of the earthworm Lumbricus terrestris L.. Cell Tissue Res. 249, 625–632 (1987). https://doi.org/10.1007/BF00217334
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DOI: https://doi.org/10.1007/BF00217334